The cache hit rate can be significantly improved by installing large-capacity cache memory modules and as-
signing a large-capacity cache (Extreme Cache) to read accesses for important operations. Extreme Cache
can be enabled or disabled for each volume and the Extreme Cache capacity can be set according to the op-
eration priority. The Extreme Cache hit rate can be checked while performance is being monitored.
Figure 9.4 Solution — Performance/Tuning
ETERNUS DX
SAS disk
Fast
SSD
Fastest
Operation C
Nearline SAS disk
High capacity, cost effective
Operation A
ETERNUS SF
Storage Cruiser
The bandwidth of the server with high
priority operations is secured by
reducing the I/Os of the servers
with low priority operations.
Improved and stabilized
responses for prioritized
operations
Server C with high
priority operations
QoS automation
Extreme Cache
Server A with low
priority operations
Server B with low
priority operations
Response time (ms)
■
Configuration Procedure
Automated Storage Tiering
Automated Storage Tiering can be achieved by using the ETERNUS DX Flexible Tier function and the ETERNUS
SF Storage Cruiser functions.
QoS automation
To automate QoS, install ETERNUS SF Storage Cruiser and the ETERNUS SF Storage Cruiser QoS Management
option on the operation management server.
Extreme Cache
To use Extreme Cache, use ETERNUS SF Storage Cruiser to enable the Extreme Cache setting for the volumes
that are used by the servers with high priority operations.
Chapter 9
Solution Configuration
9.2 Storage Optimization
140
FUJITSU Storage ETERNUS DX500 S3/DX600 S3 Disk storage system Configuration Guide (Basic)
Copyright 2014 FUJITSU LIMITED
P3AM-7732-05ENZ0
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